Improvement in baking-ovens



2 Sheets--Sheet l.

BAKINGF OVENS.

No. 121,83 Patented nep. 412, 1871.

9. FIGnl WF1-N ESSS. INVENTORS.

A. Al & J Al AULL' ZSheets--SheetL Baking Ovens.

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INVENTOFLS,

UNITED NSTATES PATENT OFFICE0 ADAM A. AULL AND JOHN A. AULL, OF BELLEFONTAINE, OHIO.

IMPROVEMENT IN BAKING-OVENS.

Specification forming part of Letters Patent No. 121,839, dated December 12, 1871.

To all whom it may concern:

Be it known that we, ADAM A. AULL and JOHN A. AULL, of Bellefontaine, in the county of Lo- Oan and State of Ohio, have invented a new and useful Improvement in Baking-Ovens, of which the following is a specification:

The invention relates to an improved construction of the furnaces and fines in an oven in which the bread is baked on a rotating table.

Figure l is a horizontal section of our improved oven in the. plane indicated by the line a' .1; in Fig. 2. Fig. 2 is a vertical section at y y in Fig. 1. Fig. 3 is a plane of the furnaces beneath the baking-chamber. Fig. 4 is a vertical section in a plane at right angles to that indicated in Fig. 2.

A represents the external wall of the oven, and B the baking-chamber, in which a horizontal table, C, is rota-ted by any suitable mechanical means upon avertical aXis, D. E E are the fur naces, of which We prefer to employ two, one upon each side of the oven, converging one toward the other, as illustrated in Fig. 3, and shown by dotted lines in Fig. l. The entire structure may be of cylindrical or other form. The tops of the furnaces are perforated to allow the gases to pass directly into the baking-chamber and to heat the bread-table, which is pertbrated to allow the gases to ascend freely and spread uniformly throughout the chamber. The bread-table may be constructed to hold the loaves or crackers, the perforations being small, or the material to be baked may be set in trays.

It is preferred to construct the table of boileriron, resting on a skeleton-frame, C', which receives the rotary movement through the medium of gearing G and shaft H, or other suitable means, preferably by steanrpower for large operations. For some purposes we prefer to construct the table with slabs of soap-stone resting on the aforesaid skeleton-frame.

The heated air and a portion of the products of combustion pass through the tops and backs of the furnaces into the baking-chamber beneath the table, rise through the perforations and through the central opening c therein, and may be allowed to escape through a discharge-flue, J, which is guarded by a damper, K, in order to confine the heat and gases to any desired extent. The gases from the furnaces may also rise through the ues e, so as to be delivered into the baking-chamber above the bread-table. The remainder of the gases and products of combustion are carried off through the smoke-discharge iiue F. This iue is chieiiy employed in kindling the fire and for getting up heat. When the coke is red-hot the damper j' in the said due is closed, and all the gases are passed through the baking-chamber, the steam being carried off through the discharge- Hue J, as before explained. By locating this crown-flue J in the center of the oven, as represented, the draught and distribution of heat are rendered more constant and uniform.

The dues e e, one of which conducts the heated gases from the anterior part of each furnace into the baking-chamber above the table, are very importantfor securing a sufficient amount of top heat and consequent uniformity in baking.

The walls and crown of the oven are preferably constructed of brick, the furnace of soapstone, and the moving portions of iron; except, when desired, soap-stone slabs may be employed for the bread-table.

While specifying these preferred materials, we do not desire to be understood as limiting ourselves thereto.

The bread may be introduced at the door I and taken out when the rotation of the table brings it again to the same place.

We claim as new- 1. The front ue or flues e, combined with the furnace or furnaces E, substantially as and for the purposes specified.

2. The combination of the perforated furnaces E, perforated revolving bread-table C', and front flue or flues e, arranged and operating substantially as and for the purposes set forth.

A. A. AULL. J. A. AULL.

Witnesses:

PHILANDER JONES, S. W. DAILEY. (6) 

